linux-kernel - Re: [PATCH v4] mm: cma: add a simple kernel module as the helper to test CMA

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Date:	Wed, 07 Mar 2012 13:11:13 +0100
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	m.szyprowski@...sung.com, "Barry Song" <Barry.Song@....com>
Cc:	workgroup.linux@....com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	"Barry Song" <Baohua.Song@....com>
Subject: Re: [PATCH v4] mm: cma: add a simple kernel module as the helper to
 test CMA

On Wed, 07 Mar 2012 12:37:39 +0100, Barry Song <Barry.Song@....com> wrote:
> Any write request to /dev/cma_test will let the module to allocate memory from
> CMA, for example:
>
> 1st time
> $ echo 1024 > /dev/cma_test
> will require cma_test to request 1MB(1024KB)
> 2nd time
> $ echo 2048 > /dev/cma_test
> will require cma_test to request 2MB(2048KB)
>
> Any read request to /dev/cma_test will let the module to free the 1st valid
> memory from CMA, for example:
>
> 1st time
> $ cat /dev/cma_test
> will require cma_test to free the 1MB allocated in the first write request
> 2nd time
> $ cat /dev/cma_test
> will require cma_test to free the 2MB allocated in the second write request
>
> Signed-off-by: Barry Song <Baohua.Song@....com>

Reviewed-by: Michal Nazarewicz <mina86@...a86.com>

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